TrustedTypePolicyFactory: isScript() method
The isScript()
method of the TrustedTypePolicyFactory
interface returns true if it is passed a valid TrustedScript
object.
Note: The purpose of the functions isScript()
, isHTML()
, and isScriptURL()
is to check if the object is a valid TrustedType object, created by a configured policy.
Syntax
js
isScript(value)
Parameters
value
-
A
TrustedScript
object.
Return value
A boolean
that is true if the object is a valid TrustedScript
object.
Examples
In the below example the constant url
was created by a policy, and therefore isScriptURL()
returns true. The second example is an attempt to fake an object, and the third is a string. Both of these will return false when passed to isScriptURL()
.
js
const myScript = policy.createScript("eval('2 + 2')");
console.log(trustedTypes.isScript(myScript)); // true;
const fake = Object.create(TrustedScript.prototype);
console.log(trustedTypes.isScript(fake)); // false
console.log(trustedTypes.isScript("eval('2 + 2')")); // false
Specifications
Specification |
---|
Trusted Types # dom-trustedtypepolicyfactory-isscript |
Browser compatibility
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